Potato onion (Allium cepa var. aggregatum G. Don) remained the most widely grown onion type in Finland up to the 1950’s, after which the more productive cultivars of common onion replaced this vegetatively propagated onion type. The Finnish accessions have been maintained in two national plant genetic resources (PGR) collections since 1990’s but new samples have been obtained still later. In this research, we analysed the genetic diversity of potato onions and shallots, grown in home gardens and in PGR collection, and compared the uniformity of the two PGR collections. One hundred ten onion samples were analysed using eight microsatellite loci, which amplified 83 alleles in total. There was a large number of genetically different samples, forming four major groups in the dendrogram. The results show that there is still a lot of genetic diversity among the Finnish potato onions, even though they are propagated vegetatively. The rich diversity in the samples obtained from citizens reflects a valuable source of genetic resources maintained by home gardeners. The national collection has been updated on the basis of the results. To ensure the preservation of the rich onion heritage, efforts are needed to increase the availability of potato onion to home gardeners and commercial growers.

土豆洋葱（洋葱变种aggregatum直到 1950 年代，G. Don) 仍然是芬兰种植最广泛的洋葱类型，此后产量更高的普通洋葱品种取代了这种无性繁殖的洋葱类型。自 1990 年代以来，芬兰的种质一直保存在两个国家植物遗传资源 (PGR) 收藏中，但更晚才获得新样品。在这项研究中，我们分析了在家庭花园和 PGR 收集中种植的马铃薯洋葱和青葱的遗传多样性，并比较了两个 PGR 收集的一致性。使用 8 个微卫星位点分析了 110 个洋葱样品，共扩增了 83 个等位基因。有大量基因不同的样本，在树状图中形成了四大类。结果表明，芬兰马铃薯洋葱之间仍有很大的遗传多样性，即使它们是无性繁殖。从公民获得的样本的丰富多样性反映了家庭园丁维护的遗传资源的宝贵来源。已根据结果更新了国家收藏。为了确保保护丰富的洋葱遗产，需要努力增加家庭园丁和商业种植者对土豆洋葱的供应。